A gastroesophageal tract pH sensor based on the H+-ISFET and the monitoring system for 24 h

This paper presents a gastroesophageal tract pH sensor based on the H+-ISFET and its monitoring system for 24 h. This pH sensor consists of an H+-ISFET, an Ag/AgCl reference electrode and a temperature sensor. The monitoring system consists of two parts: one is a portable dynamically monitor with a microprocessor and a memory. The another is a PC system that analyses the data transmitted from the dynamic monitor, and diagnoses the sickness. The specification of the pH sensor and the monitor, and the measurement results in clinic are reported in this paper.